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JavaScript: Change matching form action

Using only pure JavaScript (no jQuery or other libraries), how can I change the action of all matching forms?

If the action of a form is:
https://example.com/cart3.html

It should be changed to:
http://www.sitemaps.org/

However if the action is anything else it should remain unchanged.

I do NOT want to use jQuery or any other library.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Example</title>
</head>
<body>

<form method="get" action="https://example.com/cart1.html">
<input type="hidden" name="Product_Code1" value="9780231148341">
<input type="hidden" name="Quantity1" value="1">
<input type="submit" value="Submit" />
</form>

<form method="get" action="https://example.com/cart2.html">
<input type="hidden" name="Product_Code1" value="9780231148342">
<input type="hidden" name="Quantity1" value="1">
<input type="submit" value="Submit" />
</form>

<form method="get" action="https://example.com/cart3.html">
<input type="hidden" name="Product_Code1" value="9780231148343">
<input type="hidden" name="Quantity1" value="1">
<input type="submit" value="Submit" />
</form>

<form method="get" action="https://example.com/cart4.html">
<input type="hidden" name="Product_Code1" value="9780231148344">
<input type="hidden" name="Quantity1" value="1">
<input type="submit" value="Submit" />
</form>

<form method="get" action="https://example.com/cart2.html">
<input type="hidden" name="Product_Code1" value="9780231148342">
<input type="hidden" name="Quantity1" value="1">
<input type="submit" value="Submit" />
</form>

<form method="get" action="https://example.com/cart3.html">
<input type="hidden" name="Product_Code1" value="9780231148343">
<input type="hidden" name="Quantity1" value="1">
<input type="submit" value="Submit" />
</form>

<script type="text/javascript">

document.getElementByFormAction('https://example.com/cart3.html').action='http://www.sitemaps.org/';

</script>

</body>
</html>

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ASKER CERTIFIED SOLUTION

David S.

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